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Current Affairs January 2024

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4

The total energy released in fission of U is

A. 5 MeV

B. 10 MeV

C. 199 MeV

D. 168 MeV

Correct Answer :

C. 199 MeV


Related Questions

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A moderator, apart from its high neutron slowing power, and low non-productive neutron, should be

A. Stable under nuclear radiation

B. Corrosion resistant

C. Good thermal conductor

D. All of these

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In nuclear fission each neutron that causes fission releases

A. No new neutron

B. At least one new neutron

C. One new neutron

D. More than one new neutron

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4

Hydrogen is preferred as better coolant in comparison to CO₂ because former

A. Is lighter

B. Is inert

C. Has high specific heat

D. Is a good conductor

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4

The mass number of a substance represents the sum of total number of

A. Protons and neutrons in an atom

B. Protons and electrons in an atom

C. Neutrons and electrons in an atom

D. Protons and neutrons in a nucleus

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4

A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to

A. Slow down the speed of fast moving neutrons

B. Control the reaction

C. Reduce the temperature

D. Extracts heat from nuclear reaction

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4

Enriched uranium is one in which

A. Percentage of U₂₃₅ has been artificially increased

B. Percentage of U has been artificially increased

C. Percentage of U₂₃₄ has been artificially increased

D. Extra energy is pumped from outside

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4

Superheated steam is generated in following reactor

A. Boiling water

B. Gas cooled

C. Pressurised water

D. All of the above

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Effective moderators are those materials which contain

A. Light weight atoms

B. Heavy weight atoms

C. Critical atoms

D. Zero weight atoms

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4

The energy required to be applied to a radioactive nucleus for the emission of a neutron is

A. 1 MeV

B. 2.4 MeV

C. 4.3 MeV

D. 7.8 MeV

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Reactors designed for propulsion applications are designed for

A. Natural uranium

B. Enriched uranium

C. Pure uranium

D. Any type of uranium

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Amongst the following, the fissionable materials are

A. U₂₃₃ and Pu₂₂₉

B. U₂₃₁ and Pu₂₃₃

C. U₂₃₅ and Pu₂₃₅

D. U₂₃₈ and Pu₂₃₉

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The following present serious difficulty in designing reactor shield

A. Alpha particles

B. Beta particles

C. Thermal neutrons

D. Fast neutrons and gamma rays

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U235 will undergo fission by

A. High energy (fast) neutrons alone

B. Low energy (slow) neutrons alone

C. Either fast or slow neutrons

D. Medium energy neutrons

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Reactors for propulsion applications use

A. Natural uranium

B. Molten lead

C. Any form of uranium

D. Thorium

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A fast breeder reactor uses following as fuel

A. Enriched uranium

B. Plutonium

C. Thorium

D. U₂₃₅

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In natural uranium, the constituents of three naturally occuring isotopes are

A. U₂₃₄ = 0.006%, U₂₃₅ = 0.712% and U₂₃₈ = 99.282%

B. U₂₃₄ = 0.712%, U₂₃₅ = 0.006% and U₂₃₈ = 99.282%

C. U₂₃₄ = 99.282%, U₂₃₅ = 0.006% and U₂₃₈ = 0.712%

D. U₂₃₄ = 0.006%, U₂₃₅ = 99.282% and U₂₃₈ = 0.712%

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The function of control rods in nuclear plants is to

A. Control temperature

B. Control radioactive pollution

C. Control absorption of neutron

D. Control fuel consumption

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A fast breeder reactor

A. Uses graphite rods as moderator

B. Has powerful moderator

C. Has no moderator

D. Uses ferrite material as moderator

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In boiling water reactor, moderator is

A. Coolant itself

B. Ferrite rod

C. Graphite rod

D. Liquid sodium metal

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U233 is produced

A. As basic raw material

B. By neutron irradiation of Uz

C. By neutron irradiation of thorium

D. Artificially

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Reflector in nuclear plants is used to

A. Return the neutrons back into the core

B. Shield the radioactivity completely

C. Check pollution

D. Conserve energy

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Ideally the neutron flux in reactor should be

A. Maximum in centre and zero at side

B. Maximum at side and zero in canter

C. Uniform throughout

D. Zero throughout

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The commonly used material for shielding is

A. Lead or concrete

B. Lead and tin

C. Graphite or cadmium

D. Thick galvanised sheets

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The nuclear radiators produced in a reactor which must be shielded are

A. Electrons

B. α, β and γ rays

C. Neutron and gamma rays

D. None of these

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The process by which a heavy nucleus is spitted into two light nuclei is known as

A. Splitting

B. Fission

C. Fusion

D. Disintegration

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The primary fuel used in nuclear power plants is

A. U₂₃₅

B. U₂₃₈

C. Pu₂₃₉

D. Pu₂₃₃

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The most commonly used moderator in nuclear plants is

A. Heavy water

B. Concrete and bricks

C. Graphite and concrete

D. Graphite

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Atomic number of an element in the periodic table represents the numbers of

A. Protons in the nucleus

B. Electrons in the nucleus

C. Neutrons in the nucleus

D. Electrons in the atom

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4

Ferrite material is

A. The most fissionable material

B. The basic fuel for nuclear paints

C. Basic raw material for nuclear plants

D. The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material

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In nuclear fission

A. The original elements change into completely different elements

B. The electrons of the element change

C. The molecules rearrange themselves to form other molecules

D. None of the above